Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c94dd35800bf0b…

MALICIOUS

PDF

49.2 KB Created: 2020-08-10 01:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29472c39e1237111a110458c3dffb040 SHA-1: b8f9f80d1e2e9814ec3d97ee476589a7b0019eb6 SHA-256: 84c94dd35800bf0babca9223ad5609bf8753a3339a72509b359f584d9abf5207
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=aecc+english+communication+book+pdf'. The document body, though heavily obfuscated, contains this URL and other PDF links, indicating a likely attempt to lure users to malicious sites under the guise of providing educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=aecc+english+communication+book+pdf
    • http://files.ecriturestl.org/uploads/1/3/0/9/130969431/mizumagafepawa.pdf
    • http://lazevijim.wisewomannaturalhealth.com/uploads/1/3/0/8/130873995/3713974.pdf
    • http://files.kalkaskasnowmobiletrails.com/uploads/1/3/0/7/130775172/22431b.pdf
    • http://files.ida-apartments.com/uploads/1/3/0/8/130813837/2403365.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2707/7032/files/pantry_cabinet_plans.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/liriwudiporosisuvuti.pdf
    • https://cdn.shopify.com/s/files/1/0428/5156/5724/files/surah_al_waqiah_arab_dan_latin.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/29200407108.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30552771564.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/55061941071.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/gugiwezus.pdf
    • https://cdn.shopify.com/s/files/1/0440/8826/2821/files/67268024877.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4615/files/jifizuzaninogimoze.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/33591295098.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/pepof.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/jasezuzegojitagegupuru.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006154.bin
f8708fa11faab65b8c4788c70e7d3caf093b9cf518f191610b0f3c935636723d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6154 5668 bytes
font_01_sfnt_off0000747d.bin
32cbc02e21950c637f4a0457ef0a9714bc405e45a0733b9fe004dfefccd091b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747D 9408 bytes
font_02_sfnt_off0000928c.bin
0b7b46c85d2d4e4a4d8b5a697ecc0a3065d537388834534b65900bc63d17eb35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x928C 10416 bytes

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